Thomas a



NITE STATES THOMAS A. MAGAULAY, OB NEW YORK, N. Y.

SEWlNG-MAGHINE.

SPEGIFIGATION forming part of Letters Patent N0. 272,844, da.i:ed February 20, 1883.

Ai iplication filed September ll, 18'S2. (N0 model.)

T 0 all whpm z't may concern Be it kuown th-ai; I, THOMAS A. MACAULAY,

.ot the city, county, und Slate of New York,

have invented certain uew-and usefu l Improvements in Mechauical Movements l'or Sewing- Machines, of which the following, with the accompanyiug drawiugs, is aspeoifib-atiou, whiuh will enable others skilled in the art to muke an l nse the same.

Similar letters 1efer L0 like parts.

My invention relates to that: dass of mechauiualmovements in whicl1 it isdesirable tu obtain a omparatively great axial motion ninetydegress, more or lessiu a rock-shaft t'or operat'ingwhat; is kuown as oscillating shutatles, and to actuate a t'eed-operating mechanism from a ma-ii1 rotating needle-drivirig shaflz, as will hereinafter he r nore fnll y describvd.

In the drawiugs, Figure 1 is a vertiual section 0f the rear paart 0l' a SBWillg-machine. Fig. 2 is an end view oftl1e sarne. Fig. 8 is a detail view of the feed-shaf H aud its couneotions, partlj sl10wn in duttedline in Fig. l.

A is the rear part: of the bed 0f a sewingmachine. B is the rear portion ot' the hollow arm. U is the main neerlle-drivingshaf. D is a crank on the main drivi'ng-shafc. E is a drivingwheel. F F is a pitmau-lwer. G is a Ick-Shaft. H is a bell-crank ]ever. H is a feed-sbaft. I is a cr-ank fixed t0 the femishal't. J is a crank fixed to therouk-shaft. K is an intermediate lever 01 rock-shaft, h-aving slotted arms M and N. O is a pin connecting tha bell-crank lever with the sl1orl: slolted arm of the intermediate rockiuglver K. P is a pin uonnecting the crauk-arm J wil;h the long slotted arm N of the iutermecliate rocking shaf or lever K. R is a sucl cunneciug the pitman-lever wit:h the bell-cranl: lever H. S is a hinged cap for couneuting the pitman F wich the cra'nk D. T is a sturl connecting the bell-crank lever with the hollow-arm B. a is a pin conneeting the hinged cap S t0 the pitmau-lever F F. b isa screw counectingthepitsman-lever am1 eap S 130 the crauk D. cjs a pin connecting the link e to the lower eml of the pitman-lever. d is a pin connecting the link e to the crank I.

The shait O being rotated, the pitman-lever F F, heingconnected totheshortarm ofthebellcrank lever H by the pin R, recdves a vertical and lateral motion from the crank D, and

imparts an oscillating motiou eo the belbcrank lwer H and a rotating motion to the shafu H Through the liuk e aml crank I, which counects the pirman-lever F F with the feed-shaft H the bell-crank lever H heing connectul with the short slotted arm 0f the intgarmediale rocking shaft or lever K by the pin O entering the slot in the slxort arm M 0l' the intermediate rocker, K, and the piu P of' thecrank J eutavring the slot of the lon9; arm N of the rocker K, and the shaft G being rigirlly counected t0 the crank-arm J, the oscillating mo tion ot' the bell-crank lev er is transmitted to the shait G through the intermediate rocker,

K, and vcrauk J.

In will be perceived that the throw of the crank D is acompar-atively small throw, heilig in a full-sized mauhine not; necessarily more thau lhree-eighths of an inch. The pitm-an-lever F F being connected to the short a.nn 0f the bell-cranlr lever H, aml its long arm heing connected t-o short arm M of the intermediate rocking arm, K, am] the long arm Nofheintermediate ruckiug arm, K, belllg connected I0 a shurter arm, J, fixed t0 the rockiug shafu G, therc a is, therefore, a constau increase of m0- tion, bv reason of the comparative lengthS 0f the several armS t0 each other, imparled 120 the shalt G. 4

Auother cause of increased axial motion in the sha-ft- G is the ncearness of the centers ot' motion of the rocker K and the shalt G.

The advantages of this device are, that the proportions 0f the several arms can beCh-anged 130 modify the extent 0f motion withoub changing the throw 0f the crank D, and that an easyworking proportion 0f the levers may be preservrd, aml, if good construction or other reasons requires it, the throw of the crank D may also be changed.

It: will be readily understood that as the pitman-lever F Fgives motion to the bell-crank lever H, any oher form ot' lever operated by a. pitman-lever will auswer the purpose as weil as abell-crauk form, whether the lever so operated acts as a l'ulcrum for the pitmau-lever or not, as in Pratts pateut,No. 226,550, dated April 13,1880, and as in Scblueters patent, N0. 218,141, dated August5, 1879, and as in Schlueters patent, N0. 243,729, dated J uly 5, 12581; or a lev er counected with the main crank-shaft, operated. iudepeudently of the pitxnan-lever,

may be sn'bstituted for the hell-0tt1k lev'er, as in Gondells patent, N0. 214,9!H, dated April 29, 1879, 01 as in Pnrter am] WVhites patent, N0. 250,169, dated November 29, 1881, anti as in P0rters patent, N0. 248,214, dated October 11, 1881. Anyequivalentot the feed-shaft may be substituted theref0r, and be 0perated by the pitman-lever. I not, therefore, limita my ulaims L0 the particnlar manner of giving m0 tion t0 the primary 01 s0condary Invers OI t0 the pitman-lever, as motion may be imp arted t0 these devices in various ways, and other changes and vmiations may be made without departing from my invention.

Havingz; described my invention, I elaim- 1. 'lhe combinationof the main needle-driving shaft; O, huving crank D, with 'be pitman F, levers H and K, and r'ock-shaf G, su bstanti-ally as se forth.

2. The connbination 0f the main needle-driving sbatt O, havingcrank D, pitman-lewer F F feed-shaft H levers H and K, and rock-shafb G, snbstuntially an set forth.

3. In combination, a main rotary needledriving crank-sbaft, a ptman-lever, and feedsbafb, and primary und secondary levers operal;ing a rock-nhaft, substantially as Set; furth.

4. In c0mhination, the upright: b0llow arm, a main rot-ary needle-driving erank-shaft, a

' pitman-lever, an feed-shaft, and priniary and secundary Invers 0perating a rock-shat't, substantiall v as et f'orth.

5. In combination, a main rotary needledriving crank-shafv, a primary le"er suit-ably conneuted Wilh und operated by said craukshafn, a seeondary lever opvrated b v said primmy lever, and a rocksh-af operated by said secondary luver, f0r the pnrpose herein set fortb.

6. In combination, a main rotary needledriving crank-shaf, a primary lever suitably connected. with am] 0perated by said crankshafl', a sec0ndary lever operated b y s-aid primary lever, and a rock-shat' operated by snid secondary lever, wich a pitman-lever and feudshafn operated by said pitman, s ubstantially as set forth.

7. Tll combination ofa main rotary needledriving crank-shafr, a primary lever suitably connected -with and operated by said crankshaft, and a secoudary leVer operated by said primary lever, witzh a pitnnan-lever operating a feed-shafb, subs tantially as Set furth.

TH OS. A MAOAULAY.

Witnesses:

A. S. BROWN, W. A. JONES. 

